A .pth file is the file that is created when an AI model is trained. There is no way to convert an audio file into a .pth file. If you would like to make your own .pth file, you can look into solutions to run voice training locally on your own computer and then upload your .pth file to the Kits website. However, for the easiest and best way to train a voice, let us do it for you! Visit our voice training page to get started.